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12 papers · 2 filters
A Fractal Origin for the Mass Spectrum of Interstellar Clouds: II. Cloud Models and Power Law Slopes
B. G. Elmegreen
Three-dimensional fractal models on grids of 200**3 pixels are generated from the inverse Fourier transform of noise with a power law cutoff, exponentiated to give a log normal dis…
Dusty Acoustic Turbulence in the Nuclear Disks of two LINER Galaxies NGC 4450 and NGC 4736
D. M. Elmegreen, B. G. Elmegreen, K. S. Eberwein
The structure of dust spirals in the nuclei of the SAab-type Liner galaxies NGC 4450 and NGC 4736 is studied using archival HST PC images. The spirals are typically only several hu…
Compact Star Clusters in Nearby Dwarf Irregular Galaxies
Olivia H. Billett, Deidre A. Hunter, Bruce G. Elmegreen
Nearby dwarf irregular galaxies were searched for compact star clusters using data from the HST archives. Three of the galaxies were found to host both populous clusters (M_V<-9.5…
CO Observations of the Interacting Galaxy Pair NGC 5394/95
Michele Kaufman, Kartik Sheth, Curtis Struck +4
BIMA CO 1-0 observations are presented of the spiral galaxies NGC 5394 and NGC 5395 that have undergone a recent, grazing encounter. In NGC 5394, 80% of the CO emission detected by…
Hubble Space Telescope imaging of a peculiar stellar complex in NGC 6946
S. S. Larsen, Yu. N. Efremov, B. G. Elmegreen +4
The stellar populations in a stellar complex in NGC 6946 are analyzed on images taken with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. The complex is pec…
Theory of star formation in the central kiloparsec
Bruce G. Elmegreen
Star formation by gravitational instabilities, sequential triggering, and turbulence triggering are briefly reviewed in order to compare the various mechanisms that are observed in…